Rapid preparation and properties of flexible antifreeze hydrogel electrolyte
The composite hydrogel(PAM-LC)was prepared by one pot crosslinking polymerization with acryl-amide(AM)as a monomer added into the crosslinking agent methylenebisacrylamide(MBAA)and ammonium sulfate(APS),the L-type Kara gum(LC)and potassium chloride(KC1)as the initiator.In order to expand the application of this hydrogel as an electrolyte in extreme cold conditions,the effects of lithium salt concentration and immersion time on the freezing resistance,conductivity and mechanical stability of PAM-LC based hydrogel were studied.The results show that the unsoaked hydrogel freezes at-12.68 ℃,while the hydrogel soaked in lithium chloride solution will not freeze at-75 ℃.Through electrochemical impedance spectroscopy(EIS)test,it can be concluded that the conductivity of hydrogel can reach 8.03 ms/cm at-30 ℃,and also reach 22.77 ms/cm at room temperature,with the better conductivity than common hydrogel.The mechanical property test shows that the hydrogel not soaked at room temperature has excellent mechanical properties but poor frost resistance.After immersion in 5M lithium chloride solution for 24 hours,the hydrogel(PAM LC LiCl)still shows good mechanical stability after freezing at-20 ℃.
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